JP2003068487A - Lighting device of discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately turn on a discharge lamp by supplying a high frequency output power fitted to the kind of the discharge lamp when either one kind of discharge lamp of plural kinds of different characteristics is connected. SOLUTION: This is provided with either one kind of the discharge lamp 1 of plural kinds of different characteristics, a power supply circuit part 2, a lighting circuit part 3 to convert a direct current output of the power supply circuit part 2 into the high frequency output power by switching corresponding to an actuating frequency and to turn it on by supplying the high frequency output power to the discharge lamp 1, a discharge lamp lighting detective part 4 to detect the illumination of the discharge lamp 1, and a control circuit part 5. The control circuit part 5 continuously elevates and changes the both end voltages on the occasion of start of the discharge lamp 1, the time required to detect the lighting of the discharge lamp 1 is measured with a timer 51, the kind of the discharge lamp 1 is judged from the measured clock time, and its drive frequency is adjusted so that the high frequency output of the lighting circuit part 3 is fitted to the judged kind of the discharge lamp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for obtaining a DC output from an AC output of a commercial power source, converting the DC output into a high frequency output, supplying the high frequency output to a discharge lamp and lighting the discharge lamp. In particular, the present invention relates to a discharge lamp lighting device for lighting a discharge lamp of any one of a plurality of types having different characteristics with a high-frequency output suitable for the kind.

[0002]

2. Description of the Related Art A discharge lamp lighting device starts a discharge lamp by applying a high voltage required for starting to both ends of the discharge lamp after sufficiently preheating a filament of the discharge lamp, and outputs a proper high frequency output. To keep the discharge lamp lit.

An inverter is generally used in the discharge lamp lighting device. In this case, the discharge lamp lighting device sets the input voltage to the inverter and the oscillation frequency to that mode in each mode such as the above-mentioned preheating and starting. By adjusting under suitable conditions, the preheating current and the starting voltage suitable for the discharge lamp are supplied.

Incidentally, Japanese Unexamined Patent Publication No. 6-89787 discloses that
Disclosed is a discharge lamp lighting device capable of coping with a plurality of types by providing an operating unit that changes a switch that changes the output of an internal inverter circuit according to at least the rating and the number of discharge lamps.

[0005]

By the way, when one type of discharge lamp is not a load target but a discharge lamp of any one of a plurality of types having different characteristics is a load target, a discharge lamp is used. In order to light the discharge lamp under conditions suitable for the type of electric lamp, it is necessary to switch the operating conditions of the discharge lamp lighting device so as to set the preheating current and starting voltage, etc. that are suitable for that type of discharge lamp. . Therefore, conventionally, a lighting circuit (for example, an inverter) is provided for each type of discharge lamp.
By changing the component constants of the control circuit and the control circuit, the conditions for satisfying the characteristics of that type of discharge lamp were individually designed.

In the case of considering only the lighting of the discharge lamp, the lighting condition is set in accordance with the kind of discharge lamp having the highest voltage across the discharge lamp, which is necessary for starting, among the plurality of kinds of discharge lamps. It is possible to design a discharge lamp lighting device that can be shared by a plurality of types of discharge lamps. However, in this case, since the preheating conditions are different for each type of discharge lamp, the influence on the life of the discharge lamp becomes large, and it becomes difficult to set the optimum conditions.

The present invention has been made in view of the above circumstances, and when a discharge lamp of any one of a plurality of types having different characteristics is connected, a high frequency output suitable for that type of discharge lamp is provided. An object of the present invention is to provide a discharge lamp lighting device that can supply the light and appropriately light the discharge lamp.

[0008]

According to a first aspect of the invention for solving the above-mentioned problems, a discharge lamp of any one of a plurality of types having different characteristics and an AC output from an AC power source are rectified and By a DC power supply that obtains a DC output by smoothing and a DC output of this DC power supply is converted into a high frequency output by a switching operation according to the operating frequency, and an inverter that supplies the high frequency output to the discharge lamp and lights it A discharge lamp lighting device configured, wherein voltage rising change means for continuously increasing the voltage across the discharge lamp when starting the discharge lamp, and lighting detection means for detecting lighting of the discharge lamp, A time measuring means for measuring the time required until the lighting of the discharge lamp is detected by the lighting detecting means, and a type of the discharge lamp is discriminated from the time measured by the time measuring means. A determination unit, as the high-frequency output of the inverter to the type of discharge lamp that has been determined by the determination means is adapted, characterized in that it comprises a frequency control means for adjusting the operating frequency.

According to a second aspect of the present invention, in the discharge lamp lighting device according to the first aspect, the time required by the time measuring means from when the power is turned on to when the lighting detecting means detects the lighting of the discharge lamp. Is characterized by measuring.

According to a third aspect of the present invention, in the discharge lamp lighting device according to the first aspect, the clocking means is provided with the voltage rise changing means from the start time point when the voltage across the discharge lamp is continuously increased. It is characterized in that the time required until the lighting detection means detects the lighting of the discharge lamp is measured.

According to a fourth aspect of the present invention, in the discharge lamp lighting device according to any of the first to third aspects, the DC power source has a function of changing the level of the DC output, and the discharge lamp is started. At this time, or when the lighting detection unit detects the lighting of the discharge lamp, the level of the DC output of the DC power supply is changed in cooperation with the frequency control unit.

According to a fifth aspect of the present invention, there is provided a discharge lamp of any one of a plurality of types having different characteristics, a direct current power source for rectifying and smoothing an alternating current output from the alternating current power source to obtain a direct current output, and the direct current power source. The DC output of the power supply is converted into a high frequency output by a switching operation according to the operating frequency, and the inverter is configured to supply the high frequency output to the discharge lamp to light it, and the inverter is used for the plurality of types of discharge lamps. A discharge lamp lighting device including a resonance circuit operating under a common resonance condition, wherein voltage detecting means for detecting a voltage across the discharge lamp, and voltage across the discharge lamp detected by the voltage detecting means Discriminating means for discriminating the type of the discharge lamp and its operating frequency so that the high-frequency output of the inverter matches the type of the discharge lamp discriminated by the discriminating means. Characterized in that it comprises a frequency control means for adjusting the number.

According to a sixth aspect of the present invention, any one of a plurality of types of discharge lamps having different characteristics, a direct current power source for rectifying and smoothing an alternating current output from the alternating current power source to obtain a direct current output, and the direct current power source The DC output of the power supply is converted into a high frequency output by a switching operation according to the operating frequency, and the inverter is configured to supply the high frequency output to the discharge lamp to light it, and the inverter is used for the plurality of types of discharge lamps. A discharge lamp lighting device including a resonance circuit operating under a common resonance condition, wherein voltage detecting means for detecting a voltage across the discharge lamp, and voltage across the discharge lamp detected by the voltage detecting means The DC power supply has a function of changing the level of the DC output, and the discharge type of the type determined by the determination unit. As the high frequency output of the inverter in the lamp are compatible, and changing the level of the DC output of the DC power supply.

According to a seventh aspect of the present invention, in the discharge lamp lighting device according to the fifth aspect, there is provided storage means for storing lighting conditions for each of the plurality of types of discharge lamps, and the frequency control means stores the storage. Among the various lighting conditions stored in the means, the operating frequency of the inverter is adjusted according to the lighting condition corresponding to the type of discharge lamp discriminated by the discriminating means.

The invention according to claim 8 is the discharge lamp lighting device according to claim 6, further comprising storage means for storing lighting conditions for each of the plurality of types of discharge lamps, and the DC power source is the storage means. The DC output level of the DC power supply is changed according to the lighting condition corresponding to the discharge lamp of the type discriminated by the discriminating means among the various lighting conditions stored in.

According to a ninth aspect of the present invention, in the discharge lamp lighting device according to any one of the fifth to eighth aspects, the load current when the output of each of the plurality of types of discharge lamps is adjusted and the discharge lamp is lit. Is controlled to be constant.

According to a tenth aspect of the present invention, a discharge lamp, a DC power source for rectifying and smoothing an AC output from an AC power source to obtain a DC output, and a DC power source including a step-up / down chopper, and a DC output of the DC power source. Is a high-frequency output and supplies the discharge lamp to the discharge lamp to light the discharge lamp. The discharge lamp lighting device includes a control means for continuously controlling the DC output of the DC power supply. The means adjusts the high frequency output of the inverter only by adjusting the DC output of the DC power supply in each of the preheating, starting, lighting and abnormal modes of the discharge lamp.

According to an eleventh aspect of the present invention, in the discharge lamp lighting device according to the tenth aspect, the discharge lamp is any one of a plurality of types having different characteristics, and a voltage across the discharge lamp. And a determination means for determining the type of the discharge lamp from the voltage across the discharge lamp detected by the voltage detection means, the control means, preheating of the discharge lamp, start, In each of the lighting and abnormal modes, the high-frequency output of the inverter is adjusted only by adjusting the direct-current output of the direct-current power supply so that the high-frequency output of the inverter matches the discharge lamp of the type determined by the determination means. It is characterized by performing.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a block diagram of a discharge lamp lighting device according to a first embodiment of the present invention, FIG.
FIG. 3 is an explanatory diagram of an operating principle that is a feature of the first embodiment.

The discharge lamp lighting device according to the first embodiment is capable of connecting a discharge lamp of any one of a plurality of types having different predetermined characteristics, and as shown in FIG. In addition to the discharge lamp 1 of any type, a power supply circuit unit 2, a lighting circuit unit 3, a discharge lamp lighting detection unit 4, and a control circuit unit 5 are provided.

The power supply circuit section 2 rectifies and smoothes the AC output from the AC power supply AC to obtain a DC output.
In the example of FIG. 1, a rectifier DB that full-wave rectifies the AC voltage from the AC power supply AC into a DC voltage, and a capacitor C2 that smoothes the DC voltage full-wave rectified by the rectifier DB.

The lighting circuit section 3 is an inverter that converts the DC output of the power supply circuit section 2 into a high frequency output by a switching operation according to the operating frequency and supplies the high frequency output to the discharge lamp 1 to light it. In the example of FIG. 1, switching elements (FETs in the figure) Q1 and Q2 that are connected to the output of the power supply circuit unit 2 and a capacitor C3, and the capacitor C3 and the discharge lamp 1 are respectively provided at both ends. The current limiting choke L1 is connected between both ends of one switching element Q2, and the resonance capacitor C1 is connected in parallel to the non-power source side of the discharge lamp 1. In this configuration, the switching elements Q1, Q2
Are alternately turned on / off according to a signal from the control circuit section 5, so that the DC output of the power supply circuit section 2 is converted into a high frequency output.

The discharge lamp lighting detection unit 4 detects the lighting of the discharge lamp 1 by monitoring the voltage across the discharge lamp 1 and outputs the detection signal to the control circuit unit 5.

The control circuit section 5 is provided with a timer 51 for measuring the time taken until the discharge lamp lighting detection section 4 detects the lighting of the discharge lamp 1, and executes the control of the entire discharge lamp lighting device. Is. For example, when starting the discharge lamp 1, the control circuit unit 5 continuously increases and changes the voltage across the discharge lamp 1 through the lighting circuit unit 3, and determines the type of the discharge lamp 1 from the time measured by the timer 51. , So that the high frequency output of the lighting circuit unit 3 is adapted to the determined type of discharge lamp, the switching element Q of the lighting circuit unit 3
Adjust the operating frequencies of 1 and Q2.

Since the resonance circuit is constituted by the current limiting choke L1 and the resonance capacitor C1, the control circuit section 5 is constructed so as to output a signal for continuously changing the operating frequencies of the switching elements Q1, Q2. By doing so, when the discharge lamp 1 is started, the voltage across the discharge lamp 1 can be continuously increased and changed along the resonance characteristic curve of the resonance circuit. That is, if the operating frequencies of the switching elements Q1 and Q2 are continuously changed in the direction in which the oscillation frequency of the lighting circuit unit 3 approaches the resonance peak of the lighting circuit unit 3, the voltage across the discharge lamp 1 continuously increases. It can be changed.

Next, the operating principle that characterizes the first embodiment will be described with reference to FIG. However, for convenience of description, it is assumed that there are two kinds of discharge lamps of a plurality of types which are predetermined and have different characteristics, a discharge lamp 1A having a low starting voltage characteristic and a discharge lamp 1B having a high starting voltage characteristic.

In this case, as shown in FIG. 2 (b), at the time of starting the discharge lamp, the oscillation frequency of the lighting circuit section 3 is continuously lowered so as to approach the resonance peak of the lighting circuit section 3. When the operating frequencies of the switching elements Q1 and Q2 are continuously changed, the voltage Vla across the discharge lamp is continuously increased as shown in FIG. 2 (a). As a result, the discharge lamp 1A having a low starting voltage is lit earlier than the discharge lamp 1B having a high starting voltage. Therefore, depending on the time required until the lighting of the connected discharge lamp is detected, the discharge lamp 1A is lit. It is possible to determine the type of light.

In the example of FIG. 2, since the discharge lamp 1A is turned on at the time t1 when the oscillation frequency is f1str and the voltage between both ends is Vla1, the time required for detecting the lighting of the discharge lamp is time t1. When the time is up to the vicinity, the connected discharge lamp can be determined to be the discharge lamp 1A.
Similarly, the oscillation frequency is f2str, and the voltage across it is Vla.
Since the discharge lamp 1B is turned on at the time t2 when 2 is the time until the discharge lamp 1B is detected to be near the time t2, the connected discharge lamp is the discharge lamp 1
It can be determined to be B. In short, time t1
It suffices to be able to recognize the vicinity and the vicinity of the time point t2. Therefore, for example, the time required from the power-on time or the start time of continuously increasing and changing the voltage across the discharge lamp to the detection of lighting of the discharge lamp. By measuring, the type of discharge lamp can be determined by the time. When the discharge lamp 1B having a high starting voltage has passed the time t2 when it should be turned on, and when the oscillation frequency is f3str and the voltage at both ends is Vla3, the discharge lamp is determined to be abnormal. To be done.

Next, when the determined discharge lamp is the discharge lamp 1A, the switching element Q1 of the lighting circuit unit 3 is adjusted so that the high frequency output of the lighting circuit unit 3 matches the rated input of the discharge lamp 1A, for example. , Q2 is controlled to adjust the operating frequency of the lighting circuit unit 3 to a frequency at which the oscillation frequency of the lighting circuit unit 3 becomes the frequency of f1FULL. On the other hand, when the determined discharge lamp is the discharge lamp 1B, the operation of the switching elements Q1 and Q2 of the lighting circuit unit 3 is performed so that the high frequency output of the lighting circuit unit 3 matches the rated input of the discharge lamp 1B, for example. The control for adjusting the frequency to the frequency at which the oscillation frequency of the lighting circuit unit 3 becomes the frequency of f2FULL is executed. When it is determined that the discharge lamp is abnormal, the operating frequencies of the switching elements Q1 and Q2 of the lighting circuit unit 3 are adjusted so that the oscillation frequency of the lighting circuit unit 3 rises to the frequency of f3. The control for narrowing down the high frequency output of the lighting circuit unit 3 is executed.

According to the first embodiment, when a discharge lamp of any one of a plurality of types having different characteristics is connected, a high-frequency output suitable for the discharge lamp of that type is supplied to make the discharge lamp appropriate. Can be turned on. Further, since the starting voltage is applied by the voltage that continuously increases and changes, an excessive starting voltage is not applied to any type of discharge lamp. This enables start-up and lighting control suitable for the life of the discharge lamp. Further, since the abnormality of the discharge lamp is detected and the high frequency output of the lighting circuit unit 3 is narrowed down, the safety of the discharge lamp lighting device and the discharge lamp can be ensured.

Further, since it is possible to discriminate which type of discharge lamp the connected discharge lamp is, the conditions necessary for lighting the discharge lamp such as the preheating current and the starting voltage are connected. It can be changed according to the characteristics of the discharge lamp. Accordingly, it is possible to provide a discharge lamp lighting device that is suitable for the characteristics of the discharge lamp and can be commonly used for a plurality of types of discharge lamps having different characteristics without separately preparing a lighting circuit unit. Moreover, since the circuit configuration is simplified, there is an effect of reducing manufacturing cost and the like.

In the first embodiment, two types of discharge lamps have been described as an example, but the present invention is not limited to this, and it is easily understood that the same effect can be obtained with three or more types.

(Second Embodiment) FIG. 3 shows a second embodiment according to the present invention.
It is a block diagram of the discharge lamp lighting device of an embodiment.

As shown in FIG. 3, the discharge lamp lighting device of the second embodiment includes a discharge lamp 1, a lighting circuit section 3, and a discharge lamp lighting detection section 4 as in the first embodiment. In addition, as a difference from the first embodiment, a power supply circuit unit 2A and a control circuit unit 5A are provided.

In addition to the rectifier DB and the capacitor C2, the power supply circuit section 2A has a step-up chopper composed of an inductance element L2, a switching element (FET in the figure) Q3 and a diode D1 as a function of changing the level of DC output. According to a signal from the control circuit unit 5A, the level of the DC output is changed, for example, when the discharge lamp 1 is started or when the discharge lamp lighting detection unit 4 detects the lighting of the discharge lamp 1.

The control circuit section 5A measures the time required for the discharge lamp lighting detection section 4 to detect the lighting of the discharge lamp 1, the output of the power supply circuit section 2A, the timing result of the timer 51, etc. And an output control unit 52 that controls the switching of the switching element Q3 while monitoring the above. For example, when the discharge lamp 1 is started, the control circuit unit 5A controls the switching elements Q1 to Q3 so that the power supply circuit unit 2A and the lighting circuit unit 3 cooperate with each other so that the voltage across the discharge lamp 1 is continuously applied. The discharge lamp 1 is discriminated from the time measured by the timer 51, and the high-frequency output of the lighting circuit unit 3 is adapted to the discriminated discharge lamp. Lighting circuit section 3
The operating frequencies of the switching elements Q1 to Q3 are adjusted while cooperating with and.

That is, in the second embodiment, the lighting circuit section 3
In addition to the adjustment of the operating frequencies of the switching elements Q1 and Q2, the output controller 52 simultaneously adjusts the operating frequency of the switching element Q3 of the power supply circuit unit 2A, thereby adjusting the starting voltage and the discharge lamp 1. The light output is adjusted.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and the adjustment of the starting voltage and the adjustment of the light output can be performed more finely.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
FIG. 5 is a block diagram of the discharge lamp lighting device according to the embodiment, and FIG. 5 is an explanatory diagram of the operating principle that characterizes the third embodiment.

As shown in FIG. 4, the discharge lamp lighting device of the third embodiment includes a discharge lamp 1, a power supply circuit section 2, and a lighting circuit section 3 as in the first embodiment. As a difference from the first embodiment, the discharge lamp both-end voltage detection unit 4A,
And a control circuit section 5B. The lighting circuit unit 3
Like in the first embodiment, includes a current limiting choke L1 and a resonance capacitor C1 that form a resonance circuit that operates under a resonance condition common to a plurality of types of discharge lamps 1.

The discharge lamp both-end voltage detection unit 4A detects the both-end voltage of the discharge lamp 1, converts the both-end voltage of the discharge lamp 1 into a DC signal, and outputs the DC signal to the control circuit unit 5B.

The control circuit section 5B controls the entire discharge lamp lighting device. For example, by changing the operating frequencies of the switching elements Q1 and Q2, the oscillation frequency of the lighting circuit section 3 is changed. Thus, the light output of the discharge lamp 1 is continuously changed. In addition, the control circuit unit 5
B is a switching element Q1, so that the oscillation frequency of the lighting circuit section 3 becomes a predetermined frequency for preheating during preheating.
The operating frequency of Q2 is adjusted, and at the time of starting, the lighting circuit unit 3
Through, continuously increase and change the voltage across discharge lamp 1,
At the time of lighting, the type of the discharge lamp 1 is determined from the voltage across the discharge lamp 1 immediately after lighting detected by the discharge lamp both-end voltage detection unit 4A, and the high-frequency output of the lighting circuit unit 3 is output to the determined type of discharge lamp 1. Adjust its operating frequency so that In the control circuit section 5B, an oscillation frequency that can obtain the optical output of the target plurality of types of discharge lamps 1 is preset.

The operation principle that characterizes the third embodiment will be described in more detail with reference to FIG. 5. When the control circuit section 5B is preheated, as shown in FIG. Irrespective of the above, the switching element Q is controlled so that the oscillation frequency of the lighting circuit section 3 becomes a predetermined frequency f-ph for preheating.
By adjusting the operating frequencies of Q1 and Q2, as shown in FIG. 5 (a), the discharge lamp 1 has a voltage Vla-p for preheating the filament.
The control for applying h until t11 is executed.

Then, the preheating time (t1 from the time when the power is turned on)
After one time point), as shown in FIG. 5B, the switching elements Q1 and Q2 are changed so as to continuously decrease the oscillation frequency of the lighting circuit unit 3 toward the resonance peak of the lighting circuit unit 3. The control for continuously changing the operating frequency is executed. As a result, as shown in FIG. 5A, from time point 11, the voltage across the discharge lamp continuously rises and changes, and the starting time for reliably lighting the discharge lamp begins.

After that, when the connected discharge lamp is turned on (t12), the voltage across the discharge lamp drops to a level determined by its type. In the example of FIG. 5A, in the case of the discharge lamp 1A, it drops to the level of Vla11, and in the case of the discharge lamp 1B, Vla11.
It has fallen to 21 levels. Therefore, by detecting the voltage across the discharge lamp immediately after lighting, the type of the discharge lamp can be determined. That is, the plurality of types of discharge lamps having different levels of the voltage across the discharge lamp immediately after lighting are determined by detecting the voltage across the discharge lamp immediately after lighting. In the third embodiment, the control circuit unit is used. When detecting lighting of the discharge lamp 1 from the detection result of the discharge lamp both-ends voltage detection unit 4A, the switching element Q1 causes the oscillation frequency of the lighting circuit unit 3 to be constant at the frequency f-str at the time of lighting the discharge lamp. , After adjusting the operating frequency of Q2, the voltage across the discharge lamp 1 is detected through the voltage detector 4A across the discharge lamp,
It is configured to determine the type of discharge lamp from the detected voltage across the terminal.

Subsequently, when the type of the connected discharge lamp is completely determined from the voltage across the discharge lamp immediately after lighting obtained from the discharge lamp both-end voltage detection unit 4A (t13), the determined type of discharge lamp is released. The control for adjusting the operating frequency is executed so that the high frequency output of the lighting circuit unit 3 matches the electric lamp 1. In the example of FIG. 5, in the case of the discharge lamp 1A, the lighting circuit unit 3
The operating frequencies of the switching elements Q1 and Q2 are adjusted so that the oscillation frequency of F1 becomes the frequency of f1, and the voltage across the discharge lamp 1A is set to the voltage of Vla12. In the case of the discharge lamp 1B, the operating frequencies of the switching elements Q1 and Q2 are adjusted so that the oscillation frequency of the lighting circuit unit 3 becomes the frequency of f2, and the voltage across the discharge lamp 1B is set to the voltage of Vla22. There is.

According to the third embodiment, when any one of a plurality of types of discharge lamps having different characteristics is connected, a high-frequency output suitable for that type of discharge lamp is supplied to make the discharge lamp appropriate. Can be turned on. Further, since the starting voltage is applied by the voltage that continuously increases and changes, an excessive starting voltage is not applied to any type of discharge lamp. This enables start-up and lighting control suitable for the life of the discharge lamp. Further, there is an effect of reducing manufacturing cost and the like.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment according to the present invention.
FIG. 7 is a block diagram of the discharge lamp lighting device according to the embodiment, and FIG. 7 is an explanatory diagram of the operating principle that characterizes the fourth embodiment.

As shown in FIG. 6, the discharge lamp lighting device of the fourth embodiment is provided with a discharge lamp 1, a lighting circuit section 3, and a discharge lamp both-end voltage detection section 4A as in the first embodiment. Besides, as a difference from the first embodiment, a power supply circuit section 2A similar to that of the second embodiment and a control circuit section 5C are provided.

The control circuit section 5C includes an output control section 52A for controlling the switching of the switching element Q3 while monitoring the output of the power supply circuit section 2A and the detection result of the discharge lamp both-end voltage detection section 4A. The control of the overall lighting device is executed. For example, the control circuit unit 5
C controls the switching of the switching elements Q1 and Q2 of the lighting circuit unit 3 so that the lighting circuit unit 3 converts the DC output of the power supply circuit unit 2A into a high frequency output. In addition, the control circuit unit 5C adjusts the operating frequency of the switching element Q3 so that a predetermined preheating voltage is applied to both ends of the discharge lamp during preheating, and at the time of starting, the power supply circuit unit 2A controls the operating frequency of the discharge lamp 1. The both-end voltage is continuously increased and changed, and at the time of lighting, the type of the discharge lamp 1 is discriminated from the both-end voltage of the discharge lamp 1 immediately after lighting detected by the discharge-lamp both-end voltage detection unit 4A, and the determined type of discharge is detected. The operating frequency of the switching element Q3 of the power supply circuit unit 2A is adjusted so that the high frequency output of the lighting circuit unit 3 matches the electric lamp 1.

The operating principle that characterizes the fourth embodiment will be described in more detail with reference to FIG. 7. When the control circuit section 5C is preheated, as shown in FIG. Regardless of the temperature, a predetermined voltage V for preheating is applied across the discharge lamp.
The control for adjusting the operating frequency of the switching element Q3 is executed so that la-ph is applied. In the example of FIG. 7B, the operating frequency of the switching element Q3 is adjusted so that the output voltage of the power supply circuit unit 2A becomes the voltage Vdc-ph corresponding to the voltage Vla-ph.

Next, the preheating time (t2 from the time when the power is turned on)
7), the level of the output voltage of the power supply circuit section 2A rises and the level of the voltage applied to both ends of the discharge lamp rises, as shown in FIG. The control for continuously changing the operating frequency of the switching element Q3 is executed. This gives time 21
From then on, the voltage across the discharge lamp continuously rises and changes, and the starting time for reliably lighting the discharge lamp begins.

After that, when the connected discharge lamp is turned on (t22), the voltage across the discharge lamp drops to a level determined by its type. Also in the example of FIG. 7A, like the third embodiment, in the case of the discharge lamp 1A, it drops to the level of Vla11,
In the case of the discharge lamp 1B, the level has dropped to Vla21, and the type of discharge lamp is determined in the same manner as in the first embodiment.

Subsequently, when the type of the connected discharge lamp is completely determined from the voltage across the discharge lamp immediately after lighting obtained from the discharge lamp both-end voltage detection unit 4A (t23), the determined type of discharge lamp is released. The switching element Q3 of the power supply circuit unit 2A is arranged so that the high frequency output of the lighting circuit unit 3 matches the electric lamp 1.
The control for adjusting the operating frequency is executed. In the example of FIG. 7, in the case of the discharge lamp 1A, the operating frequency of the switching element Q3 is adjusted, the output voltage of the power supply circuit section 2A is set to Vdc1, the voltage across the discharge lamp is set to Vla12, and the discharge lamp 1B is set.
In this case, the operating frequency of the switching element Q3 is adjusted, the output voltage of the power supply circuit section 2A is set to Vdc2, and the voltage across the discharge lamp is set to Vla22.

According to the fourth embodiment, when any one of a plurality of types of discharge lamps having different characteristics is connected, a high-frequency output suitable for the type of discharge lamp is supplied to make the discharge lamp appropriate. Can be turned on. Further, since the starting voltage is applied by the voltage that continuously increases and changes, an excessive starting voltage is not applied to any type of discharge lamp. This enables start-up and lighting control suitable for the life of the discharge lamp. Further, there is an effect of reducing manufacturing cost and the like.

(Fifth Embodiment) FIG. 8 shows a fifth embodiment of the present invention.
It is a block diagram of the discharge lamp lighting device of an embodiment.

As shown in FIG. 8, the discharge lamp lighting device of the fifth embodiment includes a discharge lamp 1, a power supply circuit section 2A, a lighting circuit section 3, and a discharge lamp both-ends voltage detection section 4A. In addition to having the same configuration as that of the first embodiment, a storage unit 6 and a control circuit unit 5D are provided as a difference from the fourth embodiment.

The storage unit 6 is an EEPROM in the example of FIG. 8 and stores lighting conditions (characteristic values) for each of the target plurality of types of discharge lamps 1.

The control circuit section 5D reads from the storage section 6 the lighting conditions corresponding to the type of the discharge lamp 1 determined by using the discharge lamp both-end voltage detection section 4A, and according to the read lighting conditions (depending on the characteristic value). ), Except that the operating frequency of the switching element Q3 of the power supply circuit unit 2A is adjusted, the configuration is similar to that of the control circuit unit 5C of the fourth embodiment.

According to the fifth embodiment, when any one of a plurality of types of discharge lamps having different characteristics is connected, a high-frequency output suitable for that type of discharge lamp is supplied to appropriately discharge the discharge lamp. Can be turned on. Further, since the starting voltage is applied by the voltage that continuously increases and changes, an excessive starting voltage is not applied to any type of discharge lamp. This enables start-up and lighting control suitable for the life of the discharge lamp. Further, there is an effect of reducing manufacturing cost and the like.

The storage unit is not limited to the EEPROM,
A memory card or the like may be used. Further, not only the storage unit but also an external interface such as a communication means with another device may be used. Furthermore, the storage unit of the fifth embodiment can also be applied to the configuration of the third embodiment.

(Sixth Embodiment) In the configuration of the discharge lamp lighting device according to the sixth embodiment of the present invention, the control circuit section does not adjust the output of the discharge lamp as in the fourth embodiment, but the load current is changed. Is the same as the configuration of the discharge lamp lighting device of the fourth embodiment except that it is controlled to be constant.

That is, in the control circuit section of the sixth embodiment, the oscillation frequency which becomes the predetermined load current is preset according to the target discharge lamp, and the discharge lamp both-ends voltage detection section 4A is used to set the post-startup voltage. After the voltage across the discharge lamp is detected to determine the type of the discharge lamp, the output voltage of the power supply circuit unit 2A is adjusted so that a predetermined load current is obtained according to the type of the discharge lamp.

According to the sixth embodiment, similar to the fifth embodiment, it is possible to obtain light outputs corresponding to a plurality of types of discharge lamps having different characteristics. Further, there is an effect of reducing manufacturing cost and the like.

Instead of adjusting the output voltage of the power supply circuit section, the load current may be adjusted to a predetermined value by adjusting the oscillation frequency.

(Seventh Embodiment) FIG. 9 shows a seventh embodiment according to the present invention.
It is a block diagram of the discharge lamp lighting device of an embodiment.

As shown in FIG. 9, the discharge lamp lighting device according to the seventh embodiment is provided with a discharge lamp 1 and a lighting circuit section 3 as in the above-mentioned respective embodiments, and is also different from the above-mentioned respective embodiments. The difference is that it has a power supply circuit section 2B and a control circuit section 5E. The resonance condition is set to a value suitable for each of the target plurality of types of discharge lamps 1.

In addition to the rectifier DB and the capacitor C2, the power supply circuit section 2B has a function of changing the level of the direct current output, and is composed of an inductance element L2 ', a switching element (FET in the figure) Q3' and a diode D1 for raising and lowering. Equipped with a pressure chopper.

The control circuit section 5E includes a switching element Q
A signal for driving 1, Q2, Q3 'is output to control the entire discharge lamp lighting device. For example, an output control unit (not shown) provided in the control circuit unit 5E continuously outputs an output voltage. A signal for boosting / decreasing the voltage is output to the switching element Q3 '. In addition, switching elements Q1, Q
By driving 2 alternately, the output voltage of the power supply circuit section 2B is converted into a high frequency voltage. Further, the preheating, starting and lighting of the discharge lamp and the protection operation when the discharge lamp is abnormal are performed. In the seventh embodiment, by adjusting only the output voltage of the step-up / down chopper, the output of the lighting circuit unit 3 is changed in each of the preheating, starting, lighting and abnormal protection modes of the discharge lamp.

According to the seventh embodiment, the oscillation frequency of the lighting circuit unit is constant in all of the preheating, starting, lighting and abnormal protection modes of the discharge lamp 1. Therefore, the frequency of the lighting circuit unit is set in the control circuit unit. No control is required, and the circuit configuration of the discharge lamp lighting device is simplified.

The power supply circuit section 2B of the seventh embodiment is
It can be applied in place of the power supply circuit unit of each of the above embodiments.

(Eighth Embodiment) FIG. 10 is a block diagram of a discharge lamp lighting device according to an eighth embodiment of the present invention.

The discharge lamp lighting device according to the eighth embodiment is shown in FIG.
As shown in FIG. 7, the discharge lamp 1, the power supply circuit unit 2B, and the lighting circuit unit 3 are provided in the same manner as in the seventh embodiment.
As a difference from the embodiment, the discharge lamp both-ends voltage detection unit 4A and the control circuit unit 5F similar to those of the third embodiment are provided.

The control circuit section 5F includes a switching element Q.
Signals for driving 1, Q2 and Q3 'are output to control the entire discharge lamp lighting device. Here, there are two kinds of target plural kinds of discharge lamps 1, and the lighting circuit unit 3
Assuming that the resonance condition is common even if the types of the discharge lamp 1 are different, the control circuit unit 5F determines the type of the discharge lamp from the detection result of the discharge lamp both-ends voltage detection unit 4A, as in the fourth embodiment. The power supply circuit unit 2B is determined so that the high-frequency output of the lighting circuit unit 3 matches the determined type of discharge lamp 1.
Only the operating frequency of the switching element Q3 is adjusted.
Then, the output of the lighting circuit unit 3 is changed to control the output to the discharge lamp 1 in each of the modes of preheating, starting, lighting and abnormal time protection of the discharge lamp.

According to the eighth embodiment, since the control circuit unit 5F does not need to execute the frequency control (frequency change control) of the lighting circuit unit 3, the circuit configuration of the discharge lamp lighting device is simplified.

[0076]

As is apparent from the above, the invention according to claim 1 rectifies and smoothes an AC output from any one of a plurality of types of discharge lamps having different characteristics and an AC power source. A DC power supply that obtains a DC output, and an inverter that converts the DC output of this DC power supply into a high frequency output by a switching operation according to the operating frequency and supplies the high frequency output to the discharge lamp to light it. A discharge lamp lighting device according to claim 1, wherein voltage rise change means for continuously increasing the voltage across the discharge lamp when the discharge lamp is started, lighting detection means for detecting lighting of the discharge lamp, and lighting detection means. Means for measuring the time required until the lighting of the discharge lamp is detected by the means, and a discriminating hand for discriminating the type of the discharge lamp from the time measured by the timing means. And a frequency control means for adjusting the operating frequency so that the high-frequency output of the inverter matches the discharge lamp of the type discriminated by the discriminating means. When a type of discharge lamp is connected, a high-frequency output suitable for the type of discharge lamp can be supplied to appropriately light the discharge lamp. Further, since the starting voltage is applied by the voltage that continuously increases and changes, an excessive starting voltage is not applied to any type of discharge lamp. This enables start-up and lighting control suitable for the life of the discharge lamp.

According to a second aspect of the present invention, in the discharge lamp lighting device according to the first aspect, the time required for the time measuring means from when the power is turned on to when the lighting detecting means detects the lighting of the discharge lamp. Is measured, and even with this configuration, the same effect as that of the first embodiment can be obtained.

According to a third aspect of the present invention, in the discharge lamp lighting device according to the first aspect, the clocking means includes the time from the start time point when the voltage rise changing means continuously raises the voltage across the discharge lamp. The time required for the lighting detection means to detect the lighting of the discharge lamp is measured, and this configuration can also achieve the same effect as that of the first embodiment.

According to a fourth aspect of the present invention, in the discharge lamp lighting device according to any one of the first to third aspects, the DC power source has a function of changing the level of the DC output, and the discharge lamp is started. At that time, or at the time when the lighting of the discharge lamp is detected by the lighting detection means, the level of the DC output of the DC power supply is changed in cooperation with the frequency control means. The adjustment can be performed more finely.

According to a fifth aspect of the present invention, a discharge lamp of any one of a plurality of types having different characteristics, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC power supply The DC output of the power supply is converted into a high frequency output by a switching operation according to the operating frequency, and the inverter is configured to supply the high frequency output to the discharge lamp to light it, and the inverter is used for the plurality of types of discharge lamps. A discharge lamp lighting device including a resonance circuit operating under a common resonance condition, wherein voltage detecting means for detecting a voltage across the discharge lamp, and voltage across the discharge lamp detected by the voltage detecting means Discriminating means for discriminating the type of the discharge lamp and its operating frequency so that the high-frequency output of the inverter matches the type of the discharge lamp discriminated by the discriminating means. Since a frequency control means for adjusting the number is provided, when a discharge lamp of any one of a plurality of types having different characteristics is connected, the discharge lamp is supplied with a high-frequency output suitable for that type of discharge lamp. It can be turned on properly.

According to a sixth aspect of the present invention, there is provided a discharge lamp of any one of a plurality of types having different characteristics, a DC power source for rectifying and smoothing an AC output from the AC power source to obtain a DC output, and the DC power source. The DC output of the power supply is converted into a high frequency output by a switching operation according to the operating frequency, and the inverter is configured to supply the high frequency output to the discharge lamp to light it, and the inverter is used for the plurality of types of discharge lamps. A discharge lamp lighting device including a resonance circuit operating under a common resonance condition, wherein voltage detecting means for detecting a voltage across the discharge lamp, and voltage across the discharge lamp detected by the voltage detecting means The DC power supply has a function of changing the level of the DC output, and the discharge type of the type determined by the determination unit. Since the level of the DC output of the DC power supply is changed so that the high frequency output of the inverter matches the lamp, when a discharge lamp of any one of a plurality of types with different characteristics is connected, The discharge lamp can be appropriately turned on by supplying a high frequency output suitable for the discharge lamp.

According to a seventh aspect of the invention, in the discharge lamp lighting device according to the fifth aspect, the discharge lamp lighting device further comprises storage means for storing lighting conditions for each of the plurality of types of discharge lamps, and the frequency control means comprises the storage means. Among the various lighting conditions stored in the means, the operating frequency of the inverter is adjusted in accordance with the lighting condition corresponding to the type of discharge lamp discriminated by the discriminating means. When any one of these types of discharge lamps is connected, a high-frequency output suitable for the type of discharge lamp can be supplied to appropriately light the discharge lamp.

According to an eighth aspect of the present invention, in the discharge lamp lighting device according to the sixth aspect, there is provided storage means for storing lighting conditions for each of the plurality of types of discharge lamps, and the DC power source is the storage means. The DC output level of the DC power source is changed according to the lighting condition corresponding to the discharge lamp of the type discriminated by the discriminating means among the various lighting conditions stored in the above. When any one of the types of discharge lamps is connected, a high-frequency output suitable for the type of discharge lamp can be supplied to appropriately light the discharge lamp.

According to a ninth aspect of the present invention, in the discharge lamp lighting device according to any one of the fifth to eighth aspects, the load current when the output of each of the plurality of types of discharge lamps is adjusted and the discharge lamp is lit. Is controlled so as to be constant, so that it is possible to obtain light outputs corresponding to a plurality of types of discharge lamps having different characteristics. Further, there is an effect of reducing manufacturing cost and the like.

According to a tenth aspect of the present invention, a discharge lamp, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC power supply including a step-up / down chopper, and a DC output of the DC power supply. Is a high-frequency output and supplies the discharge lamp to the discharge lamp to light the discharge lamp. The discharge lamp lighting device includes a control means for continuously controlling the DC output of the DC power supply. The means adjusts the high-frequency output of the inverter only by adjusting the DC output of the DC power supply in each of the preheating, starting, lighting, and abnormality modes of the discharge lamp, and therefore, among the plurality of types having different characteristics, When any type of discharge lamp is connected, a high-frequency output suitable for the type of discharge lamp can be supplied to appropriately light the discharge lamp.

According to an eleventh aspect of the present invention, in the discharge lamp lighting device according to the tenth aspect, the discharge lamp is any one of a plurality of types having different characteristics, and a voltage across the discharge lamp. And a determination means for determining the type of the discharge lamp from the voltage across the discharge lamp detected by the voltage detection means, the control means, preheating of the discharge lamp, start, In each of the lighting and abnormal modes, the high-frequency output of the inverter is adjusted only by adjusting the direct-current output of the direct-current power supply so that the high-frequency output of the inverter matches the discharge lamp of the type determined by the determination means. Therefore, the circuit configuration of the discharge lamp lighting device is simplified.

[Brief description of drawings]

FIG. 1 is a block diagram of a discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operating principle that is a feature of the first embodiment.

FIG. 3 is a block diagram of a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of an operating principle that is a feature of the third embodiment.

FIG. 6 is a block diagram of a discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of an operating principle that is a feature of the fourth embodiment.

FIG. 8 is a block diagram of a discharge lamp lighting device according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram of a discharge lamp lighting device according to a seventh embodiment of the present invention.

FIG. 10 is a block diagram of a discharge lamp lighting device according to an eighth embodiment of the present invention.

[Explanation of symbols]

1 discharge lamp 2, 2A, 2B power circuit 3 lighting circuit section 4,4A discharge lamp lighting detector 5, 5A, 5B, 5C, 5D, 5E, 5F Control circuit section 6 memory

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K072 AA02 AB09 AC02 AC11 BA03                       BC01 CA16 DA02 DB03 DB09                       DC07 DC08 DD04 DE02 DE04                       EA02 EB01 EB05 GA02 GB12                       GC04 HA05 HA06 HA10

Claims (11)

[Claims] 1. A discharge lamp of any one of a plurality of types having different characteristics, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC output of the DC power supply. A discharge lamp lighting device configured by an inverter that converts a high frequency output to a high frequency output by a switching operation according to a frequency and supplies the high frequency output to the discharge lamp to light the discharge lamp. A voltage rise change means for continuously increasing the voltage across the electric lamp, a lighting detection means for detecting lighting of the discharge lamp, and a time required for the lighting detection means to detect lighting of the discharge lamp. A time measuring means for measuring, a judging means for judging the kind of the discharge lamp from the time measured by the time measuring means, and a discharge lamp of the kind judged by the judging means. As the high frequency output of the serial inverter are compatible, the discharge lamp lighting apparatus, characterized in that it comprises a frequency control means for adjusting the operating frequency. 2. The discharge lamp lighting device according to claim 1, wherein the time measuring means measures a time required from when the power is turned on to when the lighting detecting means detects the lighting of the discharge lamp. . 3. The timekeeping means is required from the start time point when the voltage rise changing means continuously raises the voltage across the discharge lamp until the lighting detection means detects the lighting of the discharge lamp. The discharge lamp lighting device according to claim 1, wherein time is measured. 4. The DC power supply has a function of changing the level of DC output, and the frequency control is performed when the discharge lamp is started or when the lighting detection unit detects lighting of the discharge lamp. The discharge lamp lighting device according to any one of claims 1 to 3, wherein the level of the DC output of the DC power supply is changed in cooperation with the means. 5. A discharge lamp of any one of a plurality of types having different characteristics, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC output of the DC power supply. Converted to a high frequency output by a switching operation according to the frequency, and configured by an inverter for supplying the high frequency output to the discharge lamp to light it,
The inverter is a discharge lamp lighting device that includes a resonance circuit that operates under a resonance condition common to the plurality of types of discharge lamps, and a voltage detection unit that detects a voltage across the discharge lamp and a voltage detection unit that detects the voltage across the discharge lamp. Discriminating means for discriminating the type of the discharge lamp from the detected voltage across the discharge lamp, and adjusting its operating frequency so that the high frequency output of the inverter matches the type of the discharge lamp discriminated by the discriminating means. And a frequency control means for controlling the discharge lamp lighting device. 6. A discharge lamp of any one of a plurality of types having different characteristics, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC output of this DC power supply. Converted to a high frequency output by a switching operation according to the frequency, and configured by an inverter for supplying the high frequency output to the discharge lamp to light it,
The inverter is a discharge lamp lighting device that includes a resonance circuit that operates under a resonance condition common to the plurality of types of discharge lamps, and a voltage detection unit that detects a voltage across the discharge lamp and a voltage detection unit that detects the voltage across the discharge lamp. And a determining means for determining the type of the discharge lamp from the voltage across the detected discharge lamp, the DC power source has a function of changing the level of the DC output, the type of the type determined by the determining means. A discharge lamp lighting device, wherein the level of the DC output of the DC power supply is changed so that the high frequency output of the inverter matches the discharge lamp. 7. A storage means for storing lighting conditions for each of the plurality of types of discharge lamps is provided, and the frequency control means includes various lighting conditions stored in the storage means.
The discharge lamp lighting device according to claim 5, wherein the operating frequency of the inverter is adjusted according to a lighting condition corresponding to the type of discharge lamp determined by the determination means. 8. A storage means for storing lighting conditions for each of the plurality of types of discharge lamps, wherein the DC power supply is
7. The DC output level of the DC power supply is changed according to a lighting condition corresponding to a discharge lamp of the type discriminated by the discriminating unit among the various lighting conditions stored in the storage unit. The discharge lamp lighting device described. 9. The method according to claim 5, wherein when the output of each of the plurality of types of discharge lamps is adjusted, the load current during lighting of the discharge lamp is controlled to be constant. The discharge lamp lighting device described. 10. A discharge lamp, a DC power supply for rectifying and smoothing an AC output from an AC power supply to obtain a DC output, and a DC power supply including a buck-boost chopper, and converting the DC output of the DC power supply to a high frequency output. A discharge lamp lighting device configured to supply the discharge lamp with light to light the discharge lamp, the discharge lamp lighting device including control means for continuously controlling a DC output of the DC power supply, the control means comprising: In each of the preheating, starting, lighting and abnormality modes, the discharge lamp lighting device is characterized in that the high frequency output of the inverter is adjusted only by adjusting the DC output of the DC power supply. 11. The discharge lamp is any one of a plurality of kinds having different characteristics, the voltage detecting means for detecting a voltage across the discharge lamp, and the voltage detecting means for detecting the voltage across the discharge lamp. And a determining means for determining the type of the discharge lamp from the voltage across the discharge lamp, the control means, in each mode of the preheating, starting, lighting and abnormality of the discharge lamp, the type of the type determined by the determining means. 11. The discharge lamp lighting device according to claim 10, wherein the high frequency output of the inverter is adjusted only by adjusting the direct current output of the direct current power supply so that the high frequency output of the inverter matches the discharge lamp.